| Meadfoot Cafe Limited | Hospitality | 2011 |
| Meadows Trading Company Limited | Wholesale & retail | 2013 |
| Meadwood Limited | Households | 1974 |
| Mecator Limited | Wholesale & retail | 2001 |
| Medical Engineering Systems Limited | Professional & scientific | 2016 |
| Medworth Plumbing & Heating Limited | Construction | 2007 |
| Meena Enterprises Limited | Health & social care | 2019 |
| Mego Employment Limited | Administrative & support | 2003 |
| Melbourne Court Torquay Flat Management Company Limited | Real estate | 1994 |
| Melibois Limited | Construction | 2016 |
| Memento Vita Ltd | Information & communication | 2020 |
| MEN of Steel Ltd | Construction | 2011 |
| Menthe Poivree Limited | Information & communication | 2014 |
| Mercan Ltd | Professional & scientific | 2002 |
| Merch Cast Ltd | Manufacturing | 2026 |
| Merchants Corner Management Co Ltd | Households | 2009 |
| Meridian Consultancy (S.W.) Limited | Construction | 1998 |
| Mespil Solar Energy Limited | Energy | 2023 |
| Metaccess Limited | Other services | 2024 |
| Meteomatics Limited | Professional & scientific | 2018 |
| Methis Limited | Wholesale & retail | 1996 |
| MG Accountants SW Limited | Professional & scientific | 2019 |
| MG Tiles (SW) Ltd | Construction | 2024 |
| MGB Marketing Results Limited | Professional & scientific | 2018 |
| Mgeorgian Ltd | Construction | 2022 |
| MGK Architecture Limited | Professional & scientific | 2005 |
| MGM Torbay Limited | Hospitality | 2005 |
| MH Limitless Ventures Ltd | Administrative & support | 2021 |
| MI Design Construction Ltd | Construction | 2021 |
| Michael Joseph Zabrana Ltd | Hospitality | 2020 |
| Mick Bettesworth Marina Consultants Limited | Professional & scientific | 2013 |
| Micro Dream Limited | Wholesale & retail | 2009 |
| Migrahush Ltd | Wholesale & retail | 2025 |
| Mike Johnson Landscapes and Construction Ltd | Construction | 2022 |
| Mike Richards Limited | Professional & scientific | 2006 |
| Mike Self Ltd | Construction | 2014 |
| Mike Strange Limited | Manufacturing | 2011 |
| Mikes Diving Limited | Wholesale & retail | 2009 |
| Mile END Garage Ltd | Wholesale & retail | 2017 |
| Milford Haven Seafoods Limited | Manufacturing | 2016 |
| Mill House Partnership Limited | Construction | 2003 |
| Millgate Motors (Paignton) Ltd | Wholesale & retail | 2015 |
| MILLIES2022 Ltd | Hospitality | 2022 |
| Millpool Limited | Hospitality | 2018 |
| Milord Homes Limited | Real estate | 1977 |
| Mindest CIC | Health & social care | 2025 |
| Mindmaps Wellbeing Ltd | Education | 2019 |
| Minerva House (Management Company) Limited | Administrative & support | 2015 |
| Mines, Minerals, Metals & Markets Limited | Professional & scientific | 2016 |
| Mini Explorers Child-Care Centre Ltd | Health & social care | 2025 |
| Minihaste Ltd | Information & communication | 2022 |
| Minimokart Ltd | Wholesale & retail | 2024 |
| Ministry of Mould Ltd | Administrative & support | 2023 |
| Minkaco Limited | Hospitality | 2019 |
| Minycled Ltd | Wholesale & retail | 2021 |
| Mirve Ltd | Wholesale & retail | 2025 |
| Mizo Development Limited | Construction | 2016 |
| Mjmedia Asia Ltd | Professional & scientific | 2014 |
| MJP Accountants LLP | | 2014 |
| ML Land and Planning Limited | Professional & scientific | 2021 |
| MM Property Lettings Limited | Real estate | 2018 |
| MMG786 Limited | Construction | 2025 |
| MNT Group Ltd | Real estate | 2026 |
| Mo's Diner Limited | Hospitality | 2021 |
| Mobile Tech Hub Limited | Wholesale & retail | 2024 |
| Moli Milo Limited | Real estate | 2022 |
| Mollie Jayne Fishing Limited | Agriculture & fishing | 2021 |
| Mollies Farm Produce Ltd | Wholesale & retail | 2026 |
| Momentum Estates (Holdings) Ltd | Real estate | 2013 |
| MONAE01 Limited | Wholesale & retail | 2025 |
| Monastery Management Limited | Real estate | 2006 |
| Mond Plastering Services Ltd | Construction | 2009 |
| Monterey Flat Management (Paignton) Limited | Households | 1981 |
| Monterosa F&D Ltd | Hospitality | 2021 |
| Montflori Estates Limited | Real estate | 2025 |
| Montrose (Wellswood) Management Company Limited | Households | 2010 |
| MOO Properties Limited | Real estate | 2011 |
| Mooboo Home Ltd | Administrative & support | 2017 |
| Mood of the Moment Photography Ltd | Extraterritorial | 2022 |
| Moorcourt (Sidmouth) Limited | Households | 1981 |
| Moore Dunn Limited | Construction | 2007 |
| Moore Dunn SW Ltd | Construction | 2022 |
| Moores Inc Ltd | Other services | 2020 |
| Moorevents Ltd | Administrative & support | 2023 |
| Moorings Management (Torquay) Limited(The) | Households | 1986 |
| Moorland View Bovey Tracey Management Limited | Households | 2004 |
| Moorlands Reach Management Company Limited | Real estate | 2012 |
| Moorleigh Residential Care Home Limited | Water & waste | 2003 |
| Moose Lettings Ltd | Real estate | 2023 |
| More Dirt Limited | Information & communication | 2012 |
| Moreheat Limited | Construction | 2011 |
| Morgan Investment and Residential Limited | Real estate | 2024 |
| Morningside Residents Association Limited | Households | 2002 |
| Morph Acquisitions Limited | Real estate | 2021 |
| Morph Consulting Limited | Professional & scientific | 2020 |
| Morph Developments Limited | Construction | 2015 |
| Morph Property Limited | Construction | 2013 |
| Morphius Ltd | Professional & scientific | 2023 |
| Mortaiz' Limited | Construction | 2017 |
| Mosinyi Pet Health Ltd | Wholesale & retail | 2025 |